A guide to Megasquirt on the 4.0
#16
#17
I took the way the quoted message was written by @Cummins93 to mean something other than Speeduino used in a piggy back fashion.
AFAIK Speeduino can not be used as a piggy back controller. At least the bit of searching I did on the Speeduino forums brought me to that conclusion. Happy to be shown otherwise.
#18
Are you talking about Speeduino?
I took the way the quoted message was written by @Cummins93 to mean something other than Speeduino used in a piggy back fashion.
AFAIK Speeduino can not be used as a piggy back controller. At least the bit of searching I did on the Speeduino forums brought me to that conclusion. Happy to be shown otherwise.
I took the way the quoted message was written by @Cummins93 to mean something other than Speeduino used in a piggy back fashion.
AFAIK Speeduino can not be used as a piggy back controller. At least the bit of searching I did on the Speeduino forums brought me to that conclusion. Happy to be shown otherwise.
however i have also looked into the Speeduino which has also moved on and can be made a total standalone, slightly cheaper https://speeduino.com/home/
#19
Seasoned Member
Joined: Jun 2021
Posts: 252
Likes: 74
From: Ortonville, mi
Year: 97
Model: Cherokee (XJ)
Engine: 4.0
Awesome info in this thread. Will be squirting my xj this spring. Nice work peeps! I did Put a Barry grant demon 4 barrel on an x j manifold with two barrels mechanically locked out. Made an adapter, mud runner power!
750 ÷ 2 = 375cfm. Thats enuff flow, yes?!
Details of construction shot.
750 ÷ 2 = 375cfm. Thats enuff flow, yes?!
Details of construction shot.
#20
CF Veteran
Joined: Mar 2015
Posts: 1,201
Likes: 153
From: Northern CT
Year: 1995
Model: Cherokee
Engine: Turbo 4.0
I used the speeduino as a piggyback to control a seperate coil and the injectors using a patch in design. This created minimal harness modification with total control of fuel and spark. The factory ecu remains and controlled all supporting systems. I used to make kits but there was not enough interest.
Anthony deserves a huge amount of credit. If it werent for him id have passed right over the speeduino as an option.
Anthony deserves a huge amount of credit. If it werent for him id have passed right over the speeduino as an option.
Last edited by Cummins93; 02-01-2024 at 08:26 PM. Reason: Spelling
#21
Senior Member
Joined: Oct 2019
Posts: 649
Likes: 175
From: Current XJ is
Year: 95
Model: Cherokee (XJ)
Engine: 4.0
Old thread, but maybe someone knows. Anyone doing this is finding this thread right off the bat, so here it goes;
You mentioned step up resistors for the hall effect sensors, more info on this? Which ones?, specific info on voltage change requirements, part numbers, pictures, locations for wiring them in, etc. ANYTHING on this subject helps.
Also, you said:
MS3 works with both Renix and SBEC2/JTEC patterns, no modifications required. But below that, you had a picture and said:
My custom 36-1 crank trigger, used with MS3x
Well, if ms3 works with both patterns, why did you install a 36-1?
Confused
Also you repeatedly mention cam sensors. Only 2000+ 4.0's have a cam sensor, in place of the distributor. to the best of my knowledge? My 96 and 98 do not have cam sensors. Do we need to add one? If so, will an OEM from 2000+ work?
On stock pre2000 setups, how does the jtec control advance and retard? How is this translated to control measures used by ms3?
I have many more Q's. I'll save them if I get a reply.
Excuse any ignorance. Thanks!
You mentioned step up resistors for the hall effect sensors, more info on this? Which ones?, specific info on voltage change requirements, part numbers, pictures, locations for wiring them in, etc. ANYTHING on this subject helps.
Also, you said:
MS3 works with both Renix and SBEC2/JTEC patterns, no modifications required. But below that, you had a picture and said:
My custom 36-1 crank trigger, used with MS3x
Well, if ms3 works with both patterns, why did you install a 36-1?
Confused
Also you repeatedly mention cam sensors. Only 2000+ 4.0's have a cam sensor, in place of the distributor. to the best of my knowledge? My 96 and 98 do not have cam sensors. Do we need to add one? If so, will an OEM from 2000+ work?
On stock pre2000 setups, how does the jtec control advance and retard? How is this translated to control measures used by ms3?
I have many more Q's. I'll save them if I get a reply.
Excuse any ignorance. Thanks!
The computer uses this info to sequencialy fire the fuel injectors.
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